If you get try to open Citra and the application crashes
That means you don't have a gpu driver that supports OpenGL 3.3.

If you get this error message: "Application Error" The application failed to initialize properly (0xc000007b) Click on OK to terminate the application"
That means you don't have the x64 variant (vc_redist.x64.exe) of Visual C++ Redistributable for Visual Studio 2015 from Microsoft. Get it here

Instructions

1 Download the emulator from this page.2 Extract it by double clicking the .zip file and open the setup .exe file.3 You will be prompted with the installation of the emulator, to proceed click next and accept plugins/addons if the installer cant find them. the installer will automatically install those files and will make a shortcut on your desktop of the 3ds emulator.4 After the installation is done, its time to find a game to load - (instructions on how to get games can be found of that page too.)5 After you installed everything you can open the emulator located on your desktop.6 To play a game simply click file>open... and load and navigate to the 3ds rom file.7 Happy gaming!